/*
 * Copyright 2024 LinQingYing. and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of this source code is governed by the Apache License 2.0,
 * which allows users to freely use, modify, and distribute the code,
 * provided they adhere to the terms of the license.
 *
 * The software is provided "as-is", and the authors are not responsible for
 * any damages or issues arising from its use.
 *
 */

package com.linqingying.cangjie.ide.search

import com.linqingying.cangjie.doc.lexer.CDocTokens
import com.linqingying.cangjie.lexer.CangJieLexer
import com.linqingying.cangjie.lexer.CjTokens
import com.linqingying.cangjie.psi.CjFile
import com.intellij.lexer.Lexer
import com.intellij.psi.PsiFile
import com.intellij.psi.impl.search.IndexPatternBuilder
import com.intellij.psi.tree.IElementType
import com.intellij.psi.tree.TokenSet

abstract class IndexPatternBuilderAdapter : IndexPatternBuilder {
    override fun getCommentStartDelta(tokenType: IElementType, tokenText: CharSequence): Int {
        return when (tokenType) {
            CjTokens.EOL_COMMENT -> 2
            CjTokens.BLOCK_COMMENT -> 2
            CjTokens.DOC_COMMENT -> 3
            else -> 0
        }
    }

    override fun getCharsAllowedInContinuationPrefix(tokenType: IElementType): String {
        return when (tokenType) {
            CjTokens.BLOCK_COMMENT -> "*"
            CjTokens.DOC_COMMENT -> "*"
            else -> ""
        }
    }
}


class CangJieIndexPatternBuilder : IndexPatternBuilderAdapter() {
    override fun getCommentTokenSet(file: PsiFile): TokenSet? {
        return if (file is CjFile) TODO_COMMENT_TOKENS else null
    }

    override fun getIndexingLexer(file: PsiFile): Lexer? {
        return if (file is CjFile) CangJieLexer() else null
    }

    override fun getCommentStartDelta(tokenType: IElementType?): Int = 0

    override fun getCommentEndDelta(tokenType: IElementType?): Int = when (tokenType) {
        CjTokens.BLOCK_COMMENT -> "*/".length
        else -> 0
    }
}

private val TODO_COMMENT_TOKENS: TokenSet = TokenSet.orSet(CjTokens.COMMENTS, TokenSet.create(CDocTokens.CDOC))
